U – S

Message

1

The SS transmits a Paging message.

<–

NR RRC: Paging

–

–

2

Check: Does the UE transmit an RRCSetupRequest message with ‘establishmentCause’ set to ‘mt-Access’?

–>

NR RRC: RRCSetupRequest

–

P

3

The SS transmits an RRCSetup message.

<–

NR RRC: RRCSetup

–

–

4

Check: Does the UE transmit an RRCSetupComplete message and a SERVICE REQUEST message?

–>

NR RRC: RRCSetupComplete

5GMM: SERVICE REQUEST

–

P

5

The SS transmits a SecurityModeCommand message.

<–

NR RRC: SecurityModeCommand

–

–

6

The UE transmits a SecurityModeComplete message.

–>

NR RRC: SecurityModeComplete

–

–

7

The SS transmits an RRCReconfiguration message and a SERVICE ACCEPT message to establish SRB2 and DRB(s).

The RRCReconfiguration message is configured using RRCReconfiguration-SRB2-DRB(n, m) where n and m are the number of DRB(s) configured with RLC-AM and RLC-UM respectively.

<–

NR RRC: RRCReconfiguration

5GMM: SERVICE ACCEPT

–

–

8

Check: Does the UE transmit an RRCReconfigurationComplete message?

–>

NR RRC: RRCReconfigurationComplete

–

P

–

EXCEPTION: Steps 9a1 to 9b5 describe behaviour that depends on UE configuration; the “lower case letter” identifies a step sequence that takes place if such configuration was conducted.

–

–

–

–

9a1-9a5

IF the UE is configured to use preconditions THEN steps 1-5 of Annex A.5.1 of TS 34.229-5 [47] take place.

–

–

–

–

9b1-9b5

ELSE steps 1-5 of Annex A.5.2 of TS 34.229-5 [47] take place.

–

–

–

–

10

The SS transmits an RRCReconfiguration message and a PDU SESSION MODIFICATION COMMAND message.

<–

NR RRC: RRCReconfiguration
5GMM: DL NAS TRANSPORT
5GSM: PDU SESSION MODIFICATION COMMAND

–

–

–

EXCEPTION: Depending upon UE implementation, steps 11 and 12 can occur in any order

–

–

–

–

11

The UE transmits an RRCReconfigurationComplete message

–>

NR RRC: RRCReconfigurationComplete

–

–

12

Check: Does the UE transmit a ULInformationTransfer message, an UL NAS TRANSPORT message and an PDU SESSION MODIFICATION COMPLETE message?

–>

NR RRC: ULInformationTransfer

5GMM: UL NAS TRANSPORT

5GSM: PDU SESSION MODIFICATION COMPLETE

–

P

–

EXCEPTION: Steps 13a1 to 13b7 describe behaviour that depends on UE configuration; the “lower case letter” identifies a step sequence that takes place if such configuration was conducted.

–

–

–

–

13a1-13a7

IF the UE is configured to use preconditions THEN steps 6-12 of Annex A.5.1 of TS 34.229-5 [47] take place.

–

–

–

–

13b1-13b5

ELSE steps 6-10 of Annex A.5.2 of TS 34.229-5 [47] take place.

–

–

–

–

Information Element

Value/remark

Comment

Condition

RRCSetupRequest ::= SEQUENCE {

rrcSetupRequest SEQUENCE {

establishmentCause

mt-Access

}

}

Information Element

Value/remark

Comment

Condition

Service type

Service type value

’0010’B

Mobile Terminated Services

Information Element

Value/remark

Comment

Condition

PDU session ID

Same value as sent in PDU SESSION ESTABLISHMENT REQUEST message.

Authorized QoS rules

Reference QoS rule #7 as defined in Table 4.8.2.1-7 using condition IMS_VOICE.

Authorized QoS flow descriptions

Reference QoS flow #5 as defined in Table 4.8.2.3-5.